There are different types of casing: The one located at the bottom of the computer where the motherboard, hard drive, optical drive, etc., are located. On the other hand, we have the casing located at the top where the touchpad and keyboard are. The other casing is formed by the top cover of the screen, which is an area very prone to impact from objects falling on it. The fact that any of the respective casings has a small scratch will not affect the performance of your product in any way, it is only a cosmetic flaw.